JPH04317805A - Pneumatic tire with reduced noise - Google Patents
Pneumatic tire with reduced noiseInfo
- Publication number
- JPH04317805A JPH04317805A JP3109647A JP10964791A JPH04317805A JP H04317805 A JPH04317805 A JP H04317805A JP 3109647 A JP3109647 A JP 3109647A JP 10964791 A JP10964791 A JP 10964791A JP H04317805 A JPH04317805 A JP H04317805A
- Authority
- JP
- Japan
- Prior art keywords
- tread
- block
- circumferential
- tire
- grooves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000007423 decrease Effects 0.000 claims abstract description 7
- 239000011295 pitch Substances 0.000 abstract description 34
- 230000002093 peripheral effect Effects 0.000 abstract 11
- 239000000835 fiber Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0318—Tread patterns irregular patterns with particular pitch sequence
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、空気入りタイヤ、中
でもアスペクトレシオ（最大幅に対する断面高さの比）
が０．６ 以下のへん平ラジアルタイヤに関し、タイヤ
騒音の低いトレッドパターンを与えるものである。タイ
ヤ騒音は様々な原因によって発生し、中でもトレッドパ
ターンに起因した、いわゆるパターンノイズの占める比
率は大きい。このパターンノイズは、主にトレッド接地
面と路面との間で圧縮された空気がトレッドの溝を介し
てトレッド接地面の外側に急激に流出し、この現象が断
続して起こるために生じるノイズで、ポンピングノイズ
とも呼ばれる。[Industrial Application Field] This invention relates to pneumatic tires, especially aspect ratio (ratio of cross-sectional height to maximum width).
This invention relates to a flat radial tire with a 0.6 or less, and provides a tread pattern with low tire noise. Tire noise is generated by various causes, and among them, so-called pattern noise caused by the tread pattern accounts for a large proportion. This pattern noise is mainly caused by the air compressed between the tread contact surface and the road surface rapidly flowing out to the outside of the tread contact surface through the tread grooves, and this phenomenon occurs intermittently. , also called pumping noise.
【０００２】0002
【従来の技術】この種のへん平ラジアルタイヤのトレッ
ドは、トレッド周線に沿って延びる複数の周溝とこれら
周溝を横切って延びる横溝とこれら周溝及び横溝で区画
されて周方向に並ぶブロック列とからなり、特に高速走
行に供されることから、タイヤ最大幅は広く、従ってト
レッド幅も広いため、周溝の幅を広げかつ、これら周溝
を横切って延びる横溝は周溝に対し鋭角に傾斜した配置
とし、高い排水性能を与えている。そしてトレッドパタ
ーンには、いわゆるピッチバリエーションを導入してパ
ターンノイズを低減することが通例である。すなわちタ
イヤトレッドの周溝及びこれを横切る横溝で区画された
ブロックに該ブロックの対辺をなす一方の横溝を含めた
構成単位を一般にピッチと称し、横溝の幅及びブロック
の周方向長さの異なる複数種（通常の乗用車用タイヤで
３〜５種）のピッチをランダムに又は規則性をもたせて
配列することによって、パターンノイズを低減するもの
である。[Prior Art] The tread of this type of flat radial tire is divided into a plurality of circumferential grooves extending along the tread circumference, lateral grooves extending across these circumferential grooves, and these circumferential grooves and lateral grooves and arranged in the circumferential direction. Because the tires are used for high-speed running, the maximum width of the tire is wide, and therefore the tread width is also wide. The structure is arranged at an acute angle, providing high drainage performance. It is customary to introduce so-called pitch variations into the tread pattern to reduce pattern noise. In other words, a structural unit including one lateral groove on the opposite side of the block divided by the circumferential groove of the tire tread and the lateral groove that crosses this is generally called a pitch, and a plurality of blocks with different widths of the lateral grooves and lengths in the circumferential direction of the block are generally referred to as pitches. Pattern noise is reduced by arranging the pitches of seeds (3 to 5 types in a typical passenger car tire) randomly or with regularity.
【０００３】0003
【発明が解決しようとする課題】またタイヤ騒音の他の
発生機構の１つとして、タイヤ転動時にその踏み込み側
で接地する際のブロックと路面との衝突音があり、この
衝突音はピッチバリエーションの導入によって軽減する
ことは不可能である。特に周溝の幅が広い場合は、衝突
音がこの周溝内で共鳴して、より大きな騒音となる。そ
こでこの発明は、パターンノイズの低いピッチバリエー
ションを導入したブロックパターンにおける、ブロック
の路面との衝突音を低減し得るトレッド構造について提
案することを目的とする。[Problems to be Solved by the Invention] Another mechanism that generates tire noise is the collision sound between a block and the road surface when the tire rolls and touches the ground on its stepping side, and this collision noise is caused by pitch variations. It is impossible to reduce this by introducing . In particular, when the width of the circumferential groove is wide, the collision sound resonates within the circumferential groove, resulting in even louder noise. Therefore, an object of the present invention is to propose a tread structure that can reduce the collision sound of blocks with the road surface in a block pattern that introduces pitch variations with low pattern noise.
【０００４】0004
【課題を解決するための手段】この発明は、１対のサイ
ドウォール間にまたがってトロイダル状に連なるトレッ
ドに、このトレッドの中央周線とトレッド端との間で該
中央周線に沿って延びる複数の周溝及びこれら周溝を横
切る向きで延びる多数の横溝にて区画され中央周線に沿
って並ぶブロック列をそなえる空気入りタイヤであって
、該ブロック列の各ブロックにおいて対辺をなす横溝の
一方を含むブロックの周方向長さで定義されるピッチに
つき、各ブロック列におけるピッチの平均値が上記中央
周線からトレッド端へ順次に減少する組合わせで各ブロ
ックを配置したことを特徴とする騒音を低減した空気入
りタイヤである。[Means for Solving the Problems] The present invention provides a tread that extends in a toroidal manner between a pair of sidewalls, and a tread that extends along the center circumference between the center circumference of the tread and the tread end. A pneumatic tire comprising a row of blocks lined up along a central circumferential line divided by a plurality of circumferential grooves and a large number of lateral grooves extending across these circumferential grooves, the lateral grooves forming opposite sides of each block in the block row. Each block is arranged in such a combination that the average value of the pitch in each block row decreases sequentially from the center circumference line to the tread edge, with respect to the pitch defined by the circumferential length of the block including one block. This is a pneumatic tire that reduces noise.
【０００５】さて図１にこの発明に従う空気入りタイヤ
のトレッド要部を示す。このトレッドは、トレッドの中
央周線Ｏに沿って延びそれぞれ中央周線Ｏの両側で対を
なす周溝１、２及び３と、これら周溝を横切る向きに延
びて周溝１〜３間又は周溝３及びトレッド端Ｅ間をつな
ぐ横溝４、５及び６によって、中央周線Ｏ上にリブ７を
区画し、さらに周溝１の片側にそれぞれ３列両側で６列
のブロック列８、９及び１０を区画してなる。FIG. 1 shows the main part of the tread of a pneumatic tire according to the present invention. This tread has circumferential grooves 1, 2 and 3 which extend along the central circumferential line O of the tread and form pairs on both sides of the central circumferential line O, and which extend in a direction across these circumferential grooves between the circumferential grooves 1 to 3 or between the circumferential grooves 1 to 3. Ribs 7 are defined on the central circumferential line O by the lateral grooves 4, 5 and 6 connecting the circumferential groove 3 and the tread edge E, and furthermore, there are three block rows on one side of the circumferential groove 1 and six block rows 8 and 9 on both sides. and 10 sections.
【０００６】この実施例において、周溝１〜３は、周溝
１と１及び１と２の間隔を等しくする一方、この間隔よ
りも周溝２と３の間隔を大きく、そして周溝３とトレッ
ド端Ｅの間隔をさらに大きくした配置である。しかし目
的によっては上記トレッドの中央部に位置する周溝の間
隔を等しくせずに、例えば周溝１と１の間隔に対し周溝
１と２の間隔を比較的広くすることができる。また周溝
の幅は、上記タイヤ軸方向幅（トレッド幅）の３〜４．
５ ％の範囲に設定することが好ましい。なおこの発明
においてトレッド幅は、タイヤを規定リムに装着後に規
定内圧を充填して規定荷重を加えた際の接地部分の最大
幅を意味する。In this embodiment, the circumferential grooves 1 to 3 have equal intervals between circumferential grooves 1 and 1 and between circumferential grooves 1 and 2, while the interval between circumferential grooves 2 and 3 is larger than this interval, and the interval between circumferential grooves 3 and 3 is made equal. This is an arrangement in which the spacing between the tread edges E is further increased. However, depending on the purpose, the intervals between the circumferential grooves located at the center of the tread may not be equal, and for example, the interval between circumferential grooves 1 and 2 may be made relatively wider than the interval between circumferential grooves 1 and 1. Further, the width of the circumferential groove is 3 to 4 times the width of the tire in the axial direction (tread width).
It is preferable to set it within a range of 5%. In this invention, the tread width refers to the maximum width of the ground contact area when the tire is mounted on a specified rim, filled with a specified internal pressure and applied with a specified load.
【０００７】横溝４〜６は、周溝に対して傾斜しかつ、
その傾斜角度α１ 〜α３ が中央周線Ｏからトレッド
端Ｅへ増大（すなわちα１＜α２ ＜α３ ）し、トレ
ッド端Ｅから中央周線Ｏへ実質上収斂する矢筈状の配置
になる。
これは中央周線Ｏ付近におけるブロックと路面との衝突
音がタイヤ騒音の大きな部分を占めるため、トレッドの
中央を連続したリブ７とし、このリブ７と周溝１，１を
介して隣接するブロック８，８からトレッド端Ｅに向か
って横溝の傾斜角を増加させたものである。それによっ
て、ブロックのエッジ部が路面に同時に接することを回
避し、ピッチノイズ成分を低減し得るトレッドパターン
とした。さらにこのトレッドパターンにおいては、横溝
の幅を横溝４から６へと順次広くしたり、あるいはブロ
ック列８〜１０のネガティブ比をほぼ等しくすることが
できる。また横溝の本数は、ブロック列１０からトレッ
ド中央（リブ７は横溝なし）に向かって順次減少させる
ことが好ましい。さらにリブ及びブロックのタイヤ軸方
向の幅はリブ７からブロック列８，９，１０へと順次増
加することが望ましい。一方溝深さは、周溝の深さと同
等か多少浅くする。[0007] The lateral grooves 4 to 6 are inclined with respect to the circumferential groove, and
The inclination angles α1 to α3 increase from the central circumferential line O to the tread edge E (that is, α1<α2<α3), resulting in a herringbone-like arrangement that substantially converges from the tread edge E to the central circumferential line O. This is because the collision sound between the block and the road surface near the center circumferential line O occupies a large part of the tire noise, so the center of the tread is a continuous rib 7, and the rib 7 and the adjacent block The inclination angle of the lateral grooves is increased from 8, 8 toward the tread end E. This prevents the edge portions of the blocks from coming into contact with the road surface at the same time, resulting in a tread pattern that can reduce pitch noise components. Further, in this tread pattern, the width of the lateral grooves can be made gradually wider from lateral grooves 4 to 6, or the negative ratios of block rows 8 to 10 can be made approximately equal. Further, it is preferable that the number of lateral grooves is gradually decreased from the block row 10 toward the center of the tread (the ribs 7 have no lateral grooves). Furthermore, it is desirable that the widths of the ribs and blocks in the tire axial direction increase sequentially from the rib 7 to the block rows 8, 9, and 10. On the other hand, the groove depth should be equal to or slightly shallower than the circumferential groove depth.
【０００８】ここでブロック列８〜１０の各ブロック列
におけるピッチ（ピッチ長さ）が、中央周線Ｏからトレ
ッド端Ｅへ順次に減少する設定とすることが肝要である
。
すなわち図示例においてピッチの平均でみたとき、ブロ
ック列８でのピッチをＰＩ とし、同様にブロック列９
はピッチＰＭ 及びブロック列１０はピッチＰＯ とし
たとき、ＰＩ ＞ＰＭ ＞ＰＯ 、好ましくはＰＩ ：
ＰＭ ：ＰＯ が１：２：４の関係にあるとよい。従っ
て各ブロック列におけるブロックの設置数又は横溝の設
置数は、ピッチとは逆に中央周線Ｏからトレッド端Ｅへ
順次に増加することになる。一方ブロック列のピッチを
上記に従う設定とした場合は、図示例のように、トレッ
ド周線で連続するリブ７を設けることが、トレッド踏面
部のブロック剛性を維持する上で望ましく、加えてリブ
７に幅の細い補助周溝を設けることも可能である。しか
しトレッド中央部のブロック剛性不足のおそれがない場
合は、リブ７を省略することもできる。[0008] Here, it is important that the pitch (pitch length) in each of the block rows 8 to 10 is set to decrease sequentially from the center circumferential line O to the tread edge E. That is, in the illustrated example, when looking at the average pitch, the pitch in block row 8 is PI, and similarly the pitch in block row 9 is PI.
is the pitch PM and the block row 10 is the pitch PO, then PI > PM > PO, preferably PI:
It is preferable that the PM:PO ratio be 1:2:4. Therefore, the number of installed blocks or the number of installed lateral grooves in each block row increases sequentially from the center circumferential line O to the tread edge E, contrary to the pitch. On the other hand, when the pitch of the block rows is set as described above, it is desirable to provide ribs 7 that are continuous along the tread circumference, as shown in the illustrated example, in order to maintain the block rigidity of the tread surface. It is also possible to provide a narrow auxiliary circumferential groove. However, if there is no risk of insufficient block rigidity at the center of the tread, the ribs 7 may be omitted.
【０００９】また上記に従うトレッドパターンに、ピッ
チバリエーションを規則的に又はランダムに導入するこ
とが、タイヤ騒音の低下をはかる上で好ましい。ブロッ
ク列１０を代表として説明すると、このブロック列１０
に３種のピッチＰ１ 、Ｐ２ 及びＰ３ （Ｐ１ ＞Ｐ
２ ＞Ｐ３ ）を導入する場合は、例えばＰ１，Ｐ１，
Ｐ１，Ｐ２，Ｐ２，Ｐ２，Ｐ２，Ｐ３，Ｐ３，Ｐ３，Ｐ
２，Ｐ２，Ｐ２，Ｐ２，Ｐ１ ─の組合せで各ブロック
を配置するか、又は複数のピッチをランダムに配置する
。ところでピッチバリエーションを導入した場合は、各
ブロック列におけるピッチの平均値が中央周線Ｏからト
レッド端Ｅへ順次に減少していればよい。[0009] Furthermore, it is preferable to introduce pitch variations regularly or randomly into the tread pattern according to the above, in order to reduce tire noise. To explain the block row 10 as a representative, this block row 10
There are three types of pitches P1, P2 and P3 (P1 > P
2 > P3), for example, P1, P1,
P1, P2, P2, P2, P2, P3, P3, P3, P
Each block is arranged in a combination of 2, P2, P2, P2, P1, or a plurality of pitches are arranged randomly. By the way, when pitch variations are introduced, it is sufficient that the average value of the pitch in each block row decreases sequentially from the center circumferential line O to the tread edge E.
【００１０】なお周溝２から延びる横溝４又は横溝４の
一部を周溝１に開口させない片側開口の溝とし、ブロッ
ク列８を連続又は断続したリブに変更することも可能で
ある。さらに横溝は中央周線Ｏに関し実質上対称形であ
るが、横溝の向きを全て同様の向きとすることも、この
発明の目的を損なわない範囲で可能である。この非対称
形の横溝配置にあっても、各ブロック列でのピッチを中
央周線Ｏからトレッド端Ｅへ順次に減少させる必要があ
る。また図示例は中央周線Ｏの両側に各３列のブロック
列を配置した対称型としたが、例えば中央周線Ｏの片側
に３列及び逆側に２列のブロック列を配置した非対称型
としてもよい。この場合においてもこの発明を適用する
ことが肝要で、すなわち２列のブロック列を配置した側
では、中央周線Ｏ寄りのブロック列のピッチを長くすれ
ばよい。It is also possible to make the lateral groove 4 extending from the circumferential groove 2 or a part of the lateral groove 4 a groove with an opening on one side without opening into the circumferential groove 1, and to change the block row 8 to continuous or intermittent ribs. Furthermore, although the lateral grooves are substantially symmetrical with respect to the central circumferential line O, it is also possible to make all the lateral grooves have the same orientation without impairing the object of the invention. Even with this asymmetrical lateral groove arrangement, it is necessary to sequentially reduce the pitch in each block row from the center circumferential line O to the tread edge E. In addition, although the illustrated example is a symmetrical type in which three rows of blocks are arranged on each side of the central circumferential line O, for example, an asymmetric type in which three rows of blocks are arranged on one side of the central circumferential line O and two rows on the opposite side is used. You can also use it as It is important to apply the present invention to this case as well; that is, on the side where two block rows are arranged, the pitch of the block rows closer to the center circumferential line O may be made longer.
【００１１】この発明に従うタイヤの他の構造は、従来
タイヤの慣習に則ったものでよい。すなわちカーカスは
、ビードコアのまわりをタイヤの内側から外側へ巻返し
た少なくとも１枚（多くて３枚）のターンナッププライ
になり、プライはレーヨン、ナイロン及びポリエステル
で代表される繊維コードをタイヤの赤道面と実質的に直
交する方向（ラジアル方向）に配列したものを用い、ベ
ルト層は、スチールコード、芳香族ポリアミド繊維コー
ドなどの非伸長性コードをタイヤの赤道面に対して１０
〜３５°の角度で配列したベルトの少なくとも２層を互
いに交差させて配置した主ベルト層の全幅にわたり、ナ
イロンコードで代表される熱収縮性コードをタイヤの赤
道面と実質上平行に配した少なくとも１枚の補助ベルト
層を、その形成に当っては主ベルト層の円周に沿ってコ
ードを複数本並べてゴム引きしたリボン状体により、並
置巻き又はらせん巻きしてなるものをそれぞれ用いる。
そしてこのベルト層上に、上記したトレッドを配置する
。Other constructions of the tire according to the invention may be in accordance with conventional tire practice. In other words, the carcass is made up of at least one turn-up ply (up to three) wrapped around a bead core from the inside of the tire to the outside, and the ply consists of fiber cords typically made of rayon, nylon, and polyester that are wrapped around the tire's equator. The belt layer is made of non-extensible cords such as steel cords or aromatic polyamide fiber cords arranged in a direction substantially perpendicular to the tire plane (radial direction), and the belt layer is made of non-extensible cords such as steel cords or aromatic polyamide fiber cords.
Over the entire width of the main belt layer, comprising at least two layers of belts arranged at an angle of ~35° and arranged across each other, at least one heat-shrinkable cord, typically a nylon cord, is arranged substantially parallel to the equatorial plane of the tire. One auxiliary belt layer is formed by arranging a plurality of cords along the circumference of the main belt layer and winding them side-by-side or spirally using a rubberized ribbon-like body, respectively. Then, the above-described tread is placed on this belt layer.
【００１２】0012
【作用】タイヤ転動中の接地域はブロックからその隣の
ブロックへと順次に移行し、ブロックが路面と衝突して
衝突音が発生し、タイヤ騒音は大きくなる。そこでこの
発明に従うタイヤにあっては、各ブロック列におけるピ
ッチの平均値をトレッドの中央周線からトレッド端へ順
次に減少することによって、各ブロック列８，９，１０
でのピッチノイズ成分の特性を異ならせてタイヤ騒音に
おけるピーク音の発生を抑えることができ、よってタイ
ヤ騒音の低減が達成される。また横溝の傾斜角度をトレ
ッドの中央周線からトレッド端へ順次に増大することに
よって、タイヤ転動時にブロックのエッジ部が路面に同
時に接することを回避し、路面との衝突音を低減する。[Operation] When the tire is rolling, the contact area sequentially shifts from one block to the next block, and the blocks collide with the road surface, producing a collision sound and increasing tire noise. Therefore, in the tire according to the present invention, the average value of the pitch in each block row is sequentially decreased from the center circumference of the tread to the tread edge.
It is possible to suppress the occurrence of peak sound in tire noise by varying the characteristics of the pitch noise component in the tire noise, thereby achieving a reduction in tire noise. In addition, by increasing the inclination angle of the lateral grooves from the center circumference of the tread to the tread edges, the edges of the blocks are prevented from coming into contact with the road surface simultaneously when the tire rolls, thereby reducing the noise of collision with the road surface.
【００１３】[0013]
【実施例】図１に示したトレッドパターンに準じて、タ
イヤサイズ２４５／４５ＺＲ１６の空気入りラジアルタ
イヤを試作した。各ブロック列のピッチの平均値は、Ｐ
Ｉ ：６８．３２ｍｍ，ＰＭ ：３４．１６ｍｍ，ＰＯ
：１７．０８ｍｍ とし、また導入したピッチバリー
ションはピッチＰ１ ：Ｐ２ ：Ｐ３ が８．５ ：１
０：１１．５となるようにした。また周溝１〜３の幅は
７ｍｍ、そして横溝４の幅は４ｍｍ、横溝５の幅は４．
３ｍｍ 、横溝６の幅は４．５ｍｍ で、深さは全て８
ｍｍとし、リブ７の幅は１４ｍｍ、ブロック列８の幅は
１６ｍｍ、ブロック列９の幅は２５ｍｍ及びブロック列
１０の幅は６８ｍｍ とした。さらに横溝の傾斜角は
、それぞれα１ ：２５°、α２ ：４６°及びα３
：７６°とした。[Example] A pneumatic radial tire with a tire size of 245/45ZR16 was manufactured as a prototype according to the tread pattern shown in FIG. 1. The average value of the pitch of each block row is P
I: 68.32mm, PM: 34.16mm, PO
:17.08mm, and the pitch variation introduced is that the pitch P1 :P2 :P3 is 8.5 :1
The ratio was set to 0:11.5. Further, the width of the circumferential grooves 1 to 3 is 7 mm, the width of the lateral groove 4 is 4 mm, and the width of the lateral groove 5 is 4 mm.
3mm, the width of the horizontal groove 6 is 4.5mm, and the depth is all 8mm.
The width of the rib 7 was 14 mm, the width of the block row 8 was 16 mm, the width of the block row 9 was 25 mm, and the width of the block row 10 was 68 mm. Furthermore, the inclination angles of the lateral grooves are α1: 25°, α2: 46°, and α3, respectively.
: 76°.
【００１４】また比較として、図２及び３に示すトレッ
ドパターンに準じて、同サイズの空気入りラジアルタイ
ヤも試作した。この比較タイヤの各ブロック列のピッチ
は全て同一とし、周溝１１の幅は１１ｍｍ及び横溝１２
の幅は４．５ ｍｍ、溝深さは全て８ｍｍとした。For comparison, a pneumatic radial tire of the same size was also prototyped according to the tread pattern shown in FIGS. 2 and 3. The pitch of each block row of this comparison tire was all the same, the width of the circumferential groove 11 was 11 mm, and the width of the lateral groove 12 was
The width of the groove was 4.5 mm, and the depth of all grooves was 8 mm.
【００１５】上記の各タイヤを８Ｊ×１６サイズのリム
に装着後に内圧３．１ｋｇｆ／ｃｍ２で空気を充てんし
た後、無音響室内において、このタイヤを、表面にセー
フティーウォークを貼った２．０ ｍΦのドラム上に荷
重４００ｋｇ で押しつけ、１ｍ離れた位置での音をマ
イクでとって音圧を測定したところ、この発明に従う供
試タイヤは比較タイヤの音圧の８５％の低い音圧を示し
た。[0015] After mounting each of the above tires on a 8J x 16 size rim and filling it with air at an internal pressure of 3.1 kgf/cm2, the tire was placed in a soundless room on a 2.0 mΦ with Safety Walk pasted on its surface. The test tire according to the present invention had a sound pressure that was 85% lower than that of the comparison tire.The test tire according to the present invention had a sound pressure that was 85% lower than that of the comparison tire. .
【００１６】[0016]
【発明の効果】この発明によれば、トレッドパターンの
各ブロックにおける衝突音を低下することができ、タイ
ヤ騒音の低い空気入りタイヤを提供し得る。According to the present invention, the collision noise in each block of the tread pattern can be reduced, and a pneumatic tire with low tire noise can be provided.
【図１】この発明に従う空気入りタイヤのトレッド要部
の展開図である。FIG. 1 is a developed view of a main part of a tread of a pneumatic tire according to the present invention.
【図２】従来のタイヤのトレッド要部の断面図である。FIG. 2 is a sectional view of a main part of a tread of a conventional tire.
【図３】従来のタイヤのトレッド要部の断面図である。FIG. 3 is a sectional view of a main part of a tread of a conventional tire.
１ 周溝 ２ 周溝 ３ 周溝 ４ 横溝 ５ 横溝 ６ 横溝 ７ リブ ８ ブロック列 ９ ブロック列 １０ ブロック列 １１ 周溝 １２ 横溝 Ｏ 中央周線 Ｅ トレッド端 1 Circumferential groove 2 Circumferential groove 3 Circumferential groove 4 Horizontal groove 5 Horizontal groove 6 Horizontal groove 7 Ribs 8 Block row 9 Block row 10 Block row 11 Circumferential groove 12 Horizontal groove O Central perimeter line E Tread edge
Claims (2)
トロイダル状に連なるトレッドに、このトレッドの中央
周線とトレッド端との間で該中央周線に沿って延びる複
数の周溝及びこれら周溝を横切る向きで延びる多数の横
溝にて区画され中央周線に沿って並ぶブロック列をそな
える空気入りタイヤであって、該ブロック列の各ブロッ
クにおいて対辺をなす横溝の一方を含むブロックの周方
向長さで定義されるピッチにつき、各ブロック列におけ
るピッチの平均値が上記中央周線からトレッド端へ順次
に減少する組合わせで各ブロックを配置したことを特徴
とする騒音を低減した空気入りタイヤ。Claim 1: A tread that extends in a toroidal manner between a pair of sidewalls, and a plurality of circumferential grooves that extend along the center circumferential line between the center circumferential line of the tread and the tread end, and these circumferential grooves. A pneumatic tire comprising a row of blocks lined up along a central circumferential line divided by a large number of lateral grooves extending in a direction transverse to the tire, the circumferential length of each block including one of the lateral grooves forming the opposite side of each block in the row of blocks. 1. A pneumatic tire with reduced noise, characterized in that each block is arranged in a combination such that the average value of the pitch in each block row decreases sequentially from the center circumference line to the tread edge with respect to the pitch defined by .
幅を有する請求項１に記載の空気入りタイヤ。2. The pneumatic tire according to claim 1, wherein the circumferential groove has a width of 3 to 4.5% of the tread width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3109647A JP2834594B2 (en) | 1991-04-16 | 1991-04-16 | Pneumatic tire with reduced noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3109647A JP2834594B2 (en) | 1991-04-16 | 1991-04-16 | Pneumatic tire with reduced noise |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04317805A true JPH04317805A (en) | 1992-11-09 |
| JP2834594B2 JP2834594B2 (en) | 1998-12-09 |
Family
ID=14515592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3109647A Expired - Fee Related JP2834594B2 (en) | 1991-04-16 | 1991-04-16 | Pneumatic tire with reduced noise |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2834594B2 (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06199110A (en) * | 1993-03-01 | 1994-07-19 | Ohtsu Tire & Rubber Co Ltd :The | Automobile tire |
| EP0627332A1 (en) * | 1993-05-31 | 1994-12-07 | PIRELLI COORDINAMENTO PNEUMATICI S.p.A. | Tyre for motor-vehicle wheels provided with a tread producing a low rolling noise |
| EP0640497A2 (en) * | 1993-08-27 | 1995-03-01 | Sumitomo Rubber Industries Limited | Pneumatic tyre |
| EP0739758A1 (en) * | 1995-04-27 | 1996-10-30 | Bridgestone Corporation | Pneumatic tires having V-shaped directional slant grooves |
| US5746849A (en) * | 1995-12-11 | 1998-05-05 | The Goodyear Tire & Rubber Company | Tire tread including tie bar |
| US5964267A (en) * | 1994-05-10 | 1999-10-12 | Uniroyal Englebert Reifen Gmbh | Tread configuration |
| EP0970822A2 (en) * | 1998-07-08 | 2000-01-12 | Continental Aktiengesellschaft | Vehicle tyre |
| US6203640B1 (en) | 1994-02-22 | 2001-03-20 | Pirelli Coordinamento Pneumatici S.P.A. | Medium/heavy duty motor-vehicle tires provided with a tread of the universal type |
| US6371180B1 (en) * | 1999-02-10 | 2002-04-16 | Bridgestone Corporation | Pneumatic tire having directional tread pattern |
| WO2008048382A1 (en) * | 2006-10-17 | 2008-04-24 | Bridgestone Firestone North American Tire, Llc | Method for designing the fundamental pitch for a tire tread pattern with variable lug count by rib |
| US20120145294A1 (en) * | 2010-12-09 | 2012-06-14 | Yoshiaki Takemoto | Pneumatic tire |
| US8701724B2 (en) * | 2002-12-19 | 2014-04-22 | Pirelli Pneumatici S.P.A. | Tyre for a vehicle wheel including a tread-band pattern |
| CN104417281A (en) * | 2013-08-29 | 2015-03-18 | 东洋橡胶工业株式会社 | Pneumatic tyre |
| JP2016168983A (en) * | 2015-03-16 | 2016-09-23 | 住友ゴム工業株式会社 | Pneumatic tire |
| US20230202240A1 (en) * | 2021-12-27 | 2023-06-29 | Sumitomo Rubber Industries, Ltd. | Tire |
-
1991
- 1991-04-16 JP JP3109647A patent/JP2834594B2/en not_active Expired - Fee Related
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06199110A (en) * | 1993-03-01 | 1994-07-19 | Ohtsu Tire & Rubber Co Ltd :The | Automobile tire |
| EP0627332A1 (en) * | 1993-05-31 | 1994-12-07 | PIRELLI COORDINAMENTO PNEUMATICI S.p.A. | Tyre for motor-vehicle wheels provided with a tread producing a low rolling noise |
| US6311748B1 (en) | 1993-05-31 | 2001-11-06 | Pirelli Coordinamento Pneumatici Spa | Tire for motor vehicle wheels having a tread producing a low rolling noise |
| US5964266A (en) * | 1993-05-31 | 1999-10-12 | Pirelli Coordinamento Pneumatici, S.P.A. | Tire for motor-vehicle wheels provided with a tread producing a low rolling noise |
| EP0640497A2 (en) * | 1993-08-27 | 1995-03-01 | Sumitomo Rubber Industries Limited | Pneumatic tyre |
| EP0640497A3 (en) * | 1993-08-27 | 1995-04-26 | Sumitomo Rubber Ind | Pneumatic tyre. |
| US5526860A (en) * | 1993-08-27 | 1996-06-18 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US6203640B1 (en) | 1994-02-22 | 2001-03-20 | Pirelli Coordinamento Pneumatici S.P.A. | Medium/heavy duty motor-vehicle tires provided with a tread of the universal type |
| US5964267A (en) * | 1994-05-10 | 1999-10-12 | Uniroyal Englebert Reifen Gmbh | Tread configuration |
| EP0739758A1 (en) * | 1995-04-27 | 1996-10-30 | Bridgestone Corporation | Pneumatic tires having V-shaped directional slant grooves |
| US6095215A (en) * | 1995-12-11 | 2000-08-01 | The Goodyear Tire & Rubber Company | Tire having tread including working rib portion |
| US5746849A (en) * | 1995-12-11 | 1998-05-05 | The Goodyear Tire & Rubber Company | Tire tread including tie bar |
| EP0970822A3 (en) * | 1998-07-08 | 2000-12-20 | Continental Aktiengesellschaft | Vehicle tyre |
| EP0970822A2 (en) * | 1998-07-08 | 2000-01-12 | Continental Aktiengesellschaft | Vehicle tyre |
| US6371180B1 (en) * | 1999-02-10 | 2002-04-16 | Bridgestone Corporation | Pneumatic tire having directional tread pattern |
| US8701724B2 (en) * | 2002-12-19 | 2014-04-22 | Pirelli Pneumatici S.P.A. | Tyre for a vehicle wheel including a tread-band pattern |
| US9840115B2 (en) | 2002-12-19 | 2017-12-12 | Pirelli Pneumatici S.P.A. | Tyre for a vehicle wheel including a tread-band pattern |
| WO2008048382A1 (en) * | 2006-10-17 | 2008-04-24 | Bridgestone Firestone North American Tire, Llc | Method for designing the fundamental pitch for a tire tread pattern with variable lug count by rib |
| US20120145294A1 (en) * | 2010-12-09 | 2012-06-14 | Yoshiaki Takemoto | Pneumatic tire |
| US9242511B2 (en) * | 2010-12-09 | 2016-01-26 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire with tread having pitch Pm > pitch Pc > pitch Ps |
| CN104417281A (en) * | 2013-08-29 | 2015-03-18 | 东洋橡胶工业株式会社 | Pneumatic tyre |
| JP2016168983A (en) * | 2015-03-16 | 2016-09-23 | 住友ゴム工業株式会社 | Pneumatic tire |
| US20230202240A1 (en) * | 2021-12-27 | 2023-06-29 | Sumitomo Rubber Industries, Ltd. | Tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2834594B2 (en) | 1998-12-09 |
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